Question 1

An example of cumulative radiation exposure is:

Accepted Answer

A) cataracts. 
B) leukemia. 
C) cancer. 
D) all of the above. 
A) cataracts. 
B) leukemia. 
C) cancer. 
D) all of the above.

Question 2

All the following are true statements about film badges except:

Accepted Answer

A) they should be worn at work only. 
B) the badge is usually worn for 3 to 4 weeks before returning it for reading. 
C) they should be worn when any form of x-ray is taken. 
D) if an assistant follows all safety precautions; exposure should be near zero. 
A) they should be worn at work only. 
B) the badge is usually worn for 3 to 4 weeks before returning it for reading. 
C) they should be worn when any form of x-ray is taken. 
D) if an assistant follows all safety precautions; exposure should be near zero.

Question 3

Because the entire x-ray area is considered a radiation hazard area,a radiation hazard sign must be posted in:

Accepted Answer

A) sight of patients. 
B) sight of personnel. 
C) the doctor's private office. 
D) both a and b 
A) sight of patients. 
B) sight of personnel. 
C) the doctor's private office. 
D) both a and b

Question 4

All of the following structures will appear radiolucent on dental x-ray film except:

Accepted Answer

A) metal restorations. 
B) soft tissue. 
C) tooth decay. 
D) dental pulp. 
A) metal restorations. 
B) soft tissue. 
C) tooth decay. 
D) dental pulp.

Question 5

One of the earliest signs of overexposure to x-rays may be:

Accepted Answer

A) keratosis. 
B) loss of hair. 
C) erythema. 
D) blindness. 
A) keratosis. 
B) loss of hair. 
C) erythema. 
D) blindness.

Question 6

If the operator's film badge indicates an exposure to small amounts of radiation,what should be done?

Accepted Answer

A) Consult a physician. 
B) Ignore the report. 
C) Evaluate the x-ray equipment and techniques. 
D) Change the mA and kVp. 
A) Consult a physician. 
B) Ignore the report. 
C) Evaluate the x-ray equipment and techniques. 
D) Change the mA and kVp.

Question 7

The fuzzy or blurred area around an image is called ____.It can be reduced by ____.

Accepted Answer

A) distortion; limiting movement 
B) a penumbra; limiting movement 
C) distortion; using fast film 
D) a penumbra; using fast film 
A) distortion; limiting movement 
B) a penumbra; limiting movement 
C) distortion; using fast film 
D) a penumbra; using fast film

Question 8

A step-down transformer is necessary within the x-ray circuitry to:

Accepted Answer

A) increase exposure time. 
B) move electrons at a high speed to the target. 
C) boil off electrons from the filament. 
D) do all of the above. 
A) increase exposure time. 
B) move electrons at a high speed to the target. 
C) boil off electrons from the filament. 
D) do all of the above.

Question 9

Who should hold the film in a patient's mouth if the patient is unable to do so?

Accepted Answer

A) Receptionist 
B) Parent or relative of the patient 
C) Assistant 
D) Dentist 
A) Receptionist 
B) Parent or relative of the patient 
C) Assistant 
D) Dentist

Question 10

One of the rules of radiation protection is never stand closer than _____ feet from the x-ray unit during an exposure unless you are behind a barrier.

Accepted Answer

A) 2 
B) 6 
C) 10 
D) 15 
A) 2 
B) 6 
C) 10 
D) 15

Question 11

The time lapse from x-ray exposure until noticeable damage occurs is known as:

Accepted Answer

A) the latent period. 
B) chronic exposure. 
C) the cumulative period. 
D) none of the above. 
A) the latent period. 
B) chronic exposure. 
C) the cumulative period. 
D) none of the above.

Question 12

Damage to which type of cell is passed on to future generations?

Accepted Answer

A) Somatic cell 
B) Genetic cell 
C) Either somatic or genetic cells 
D) Neither somatic cells nor genetic cells 
A) Somatic cell 
B) Genetic cell 
C) Either somatic or genetic cells 
D) Neither somatic cells nor genetic cells

Question 13

A radiograph that has an overall gray appearance is generally preferred.This radiograph is said to have:

Accepted Answer

A) high density. 
B) low density. 
C) high contrast. 
D) low contrast. 
A) high density. 
B) low density. 
C) high contrast. 
D) low contrast.

Question 14

The dentist who is credited with the first practical use of radiographs in dentistry in 1896 is:

Accepted Answer

A) Wilhelm Conrad Roentgen. 
B) Edmund Kells. 
C) John Greenwood. 
D) G.V. Black. 
A) Wilhelm Conrad Roentgen. 
B) Edmund Kells. 
C) John Greenwood. 
D) G.V. Black.

Question 15

Which of the following statements is true concerning the structure of the atom?

Accepted Answer

A) The nucleus contains protons and electrons. 
B) Electrons have no weight or mass. 
C) The orbital path of an electron around the nucleus is called an electron shell. 
D) Electrons are unstable in their orbits and shift freely. 
A) The nucleus contains protons and electrons. 
B) Electrons have no weight or mass. 
C) The orbital path of an electron around the nucleus is called an electron shell. 
D) Electrons are unstable in their orbits and shift freely.

Question 16

Secondary radiation:

Accepted Answer

A) is often referred to as the useful beam. 
B) is often referred to as the primary beam. 
C) refers to x-radiation that is created when the primary beam interacts with matter. 
D) is a form of radiation that occurs when an x-ray beam has been deflected from its path by interaction with matter. 
A) is often referred to as the useful beam. 
B) is often referred to as the primary beam. 
C) refers to x-radiation that is created when the primary beam interacts with matter. 
D) is a form of radiation that occurs when an x-ray beam has been deflected from its path by interaction with matter.

Question 17

Exposure to radiation:

Accepted Answer

A) no matter how small, has the potential to cause harmful biologic changes. 
B) has a threshold, below which exposure is entirely safe. 
C) is safer when there is a single, large dose rather than a series of smaller doses. 
D) from a dental x-ray machine does not involve particulate radiation and is completely safe. 
A) no matter how small, has the potential to cause harmful biologic changes. 
B) has a threshold, below which exposure is entirely safe. 
C) is safer when there is a single, large dose rather than a series of smaller doses. 
D) from a dental x-ray machine does not involve particulate radiation and is completely safe.

Question 18

Anything that occupies space and has a form or shape is:

Accepted Answer

A) energy. 
B) a solid. 
C) matter. 
D) a photon. 
A) energy. 
B) a solid. 
C) matter. 
D) a photon.

Exam 38: Foundations of Radiography, Radiographic Equipment, and Radiation Safety

An example of cumulative radiation exposure is:

All the following are true statements about film badges except:

Because the entire x-ray area is considered a radiation hazard area,a radiation hazard sign must be posted in:

All of the following structures will appear radiolucent on dental x-ray film except:

One of the earliest signs of overexposure to x-rays may be:

If the operator's film badge indicates an exposure to small amounts of radiation,what should be done?

The fuzzy or blurred area around an image is called ____.It can be reduced by ____.

A step-down transformer is necessary within the x-ray circuitry to:

Who should hold the film in a patient's mouth if the patient is unable to do so?

One of the rules of radiation protection is never stand closer than _____ feet from the x-ray unit during an exposure unless you are behind a barrier.

The time lapse from x-ray exposure until noticeable damage occurs is known as:

Damage to which type of cell is passed on to future generations?

A radiograph that has an overall gray appearance is generally preferred.This radiograph is said to have:

The dentist who is credited with the first practical use of radiographs in dentistry in 1896 is:

Which of the following statements is true concerning the structure of the atom?

Secondary radiation:

Exposure to radiation:

Anything that occupies space and has a form or shape is:

History of Dentistry

The Professional Dental Assistant

The Dental Healthcare Team

Dental Ethics

Dentistry and the Law

General Anatomy

General Physiology

Oral Embryology and Histology

Head and Neck Anatomy

Landmarks of the Face and Oral Cavity

Overview of the Dentitions

Tooth Morphology

Dental Caries

Periodontal Disease

Preventive Dentistry

Nutrition

Oral Pathology

Microbiology

Disease Transmission and Infection Prevention

Principles and Techniques of Disinfection

Principles and Techniques of Instrument Processing and Sterilization

Regulatory and Advisory Agencies

Chemical and Waste Management

Dental Unit Waterlines

Ergonomics

The Patient Record

Vital Signs

Oral Diagnosis and Treatment Planning

The Special Needs and Medically Compromised Patient

Principles of Pharmacology

Assisting in a Medical Emergency

The Dental Office

Delivering Dental Care

Dental Hand Instruments

Dental Handpieces and Accessories

Moisture Control

Anesthesia and Pain Control

Digital Imaging, Dental Film, and Processing Radiographs

Legal Issues, Quality Assurance, and Infection Prevention

Intraoral Imaging

Extraoral Imaging

Restorative and Esthetic Dental Materials

Dental Liners, Bases, and Bonding Systems

Dental Cements

Impression Materials

Laboratory Materials and Procedures

General Dentistry

Matrix Systems for Restorative Dentistry

Fixed Prosthodontics

Provisional Coverage

Removable Prosthodontics

Dental Implants

Endodontics

Periodontics

Oral and Maxillofacial Surgery

Pediatric Dentistry

Coronal Polishing

Dental Sealants

Orthodontics

Communication in the Dental Office

Business Operating Systems

The fuzzy or blurred area around an image is called .It can be reduced by .